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Original Message
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| RE: Draw through or blow through? |
| By Gerry Proctor - 02/07/2005 2:45:17 PM; IP 207.133.188.254 |
Draw through isn't difficult at all for a roots-type supercharger. You'd have to rework the carbs for the supercharger but it's so common that it's a "so what" as far as impact. I saw one setup where a guy used three four barrels. Mounting in a turbo or centrifugal would be a bit difficult and work no better than it ever has. In the early days, most turbo setups were draw through and had issues with lag, fuel puddling, starting that show up when you put the carburetor a long way from the intake valve. Draw through really only works well on roots blowers.
Blow through creates some issues that have largely been solved with electronic fuel injection. Doing it on a carbureted engine isn't impossible at all. You can buy a centrifugal supercharger from Vortec(I think it's Vortec, anyway) that included a pressure chamber for the carburetor. No reason you couldn't build a chamber for a tri-power set up. But I suppose this is one of those "Just because you can do it doesn't mean it's a good idea" things. Expect to have some difficulty getting the carbs calibrated for the boost. And other than making some kind of style statement, this would be a pretty marginal setup. Tri-power manifolds and carbs were never intended to flow a lot of air. Rated at the four barrel's 1.5" hg pressure drop, the tri-power set up comes in at around 700cfm. |
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